Which of the following is not needed to make a model of the water cycle

. an energy source
. water
. a closed container
. a drain

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll